package com.fly.gateway.config;

import java.util.ArrayList;
import java.util.List;

import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

/***
 * 聚合各个服务的swagger接口
 */
@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider
{
    /**
     * 网关路由
     */
    private final RouteLocator routeLocator;
    
    private final GatewayProperties gatewayProperties;
    
    @Override
    public List<SwaggerResource> get()
    {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId())).forEach(route -> {
            route.getPredicates()
                .stream()
                .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                .forEach(predicateDefinition -> resources.add(swaggerResource(route.getId(), predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("**", "v2/api-docs"))));
        });
        return resources;
    }
    
    private SwaggerResource swaggerResource(String name, String location)
    {
        log.info("name:{},location:{}", name, location);
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }
}
